2 * Copyright (c) 2012-2013 Clément Bœsch <u pkh me>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "subtitles.h"
23 #include "avio_internal.h"
24 #include "libavutil/avassert.h"
25 #include "libavutil/avstring.h"
27 void ff_text_init_avio(FFTextReader *r, AVIOContext *pb)
31 r->buf_pos = r->buf_len = 0;
33 for (i = 0; i < 2; i++)
34 r->buf[r->buf_len++] = avio_r8(r->pb);
35 if (strncmp("\xFF\xFE", r->buf, 2) == 0) {
38 } else if (strncmp("\xFE\xFF", r->buf, 2) == 0) {
42 r->buf[r->buf_len++] = avio_r8(r->pb);
43 if (strncmp("\xEF\xBB\xBF", r->buf, 3) == 0) {
50 void ff_text_init_buf(FFTextReader *r, void *buf, size_t size)
52 memset(&r->buf_pb, 0, sizeof(r->buf_pb));
53 ffio_init_context(&r->buf_pb, buf, size, 0, NULL, NULL, NULL, NULL);
54 ff_text_init_avio(r, &r->buf_pb);
57 int64_t ff_text_pos(FFTextReader *r)
59 return avio_tell(r->pb) - r->buf_len + r->buf_pos;
62 int ff_text_r8(FFTextReader *r)
66 if (r->buf_pos < r->buf_len)
67 return r->buf[r->buf_pos++];
68 if (r->type == FF_UTF16LE) {
69 GET_UTF16(val, avio_rl16(r->pb), return 0;)
70 } else if (r->type == FF_UTF16BE) {
71 GET_UTF16(val, avio_rb16(r->pb), return 0;)
73 return avio_r8(r->pb);
79 PUT_UTF8(val, tmp, r->buf[r->buf_len++] = tmp;)
80 return r->buf[r->buf_pos++]; // buf_len is at least 1
83 void ff_text_read(FFTextReader *r, char *buf, size_t size)
85 for ( ; size > 0; size--)
86 *buf++ = ff_text_r8(r);
89 int ff_text_eof(FFTextReader *r)
91 return r->buf_pos >= r->buf_len && avio_feof(r->pb);
94 int ff_text_peek_r8(FFTextReader *r)
97 if (r->buf_pos < r->buf_len)
98 return r->buf[r->buf_pos];
100 if (!avio_feof(r->pb)) {
108 AVPacket *ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q,
109 const uint8_t *event, int len, int merge)
111 AVPacket *subs, *sub;
113 if (merge && q->nb_subs > 0) {
114 /* merge with previous event */
117 sub = &q->subs[q->nb_subs - 1];
119 if (av_grow_packet(sub, len) < 0)
121 memcpy(sub->data + old_len, event, len);
125 if (q->nb_subs >= INT_MAX/sizeof(*q->subs) - 1)
127 subs = av_fast_realloc(q->subs, &q->allocated_size,
128 (q->nb_subs + 1) * sizeof(*q->subs));
132 sub = &subs[q->nb_subs++];
133 if (av_new_packet(sub, len) < 0)
135 sub->flags |= AV_PKT_FLAG_KEY;
136 sub->pts = sub->dts = 0;
137 memcpy(sub->data, event, len);
142 static int cmp_pkt_sub_ts_pos(const void *a, const void *b)
144 const AVPacket *s1 = a;
145 const AVPacket *s2 = b;
146 if (s1->pts == s2->pts) {
147 if (s1->pos == s2->pos)
149 return s1->pos > s2->pos ? 1 : -1;
151 return s1->pts > s2->pts ? 1 : -1;
154 static int cmp_pkt_sub_pos_ts(const void *a, const void *b)
156 const AVPacket *s1 = a;
157 const AVPacket *s2 = b;
158 if (s1->pos == s2->pos) {
159 if (s1->pts == s2->pts)
161 return s1->pts > s2->pts ? 1 : -1;
163 return s1->pos > s2->pos ? 1 : -1;
166 void ff_subtitles_queue_finalize(FFDemuxSubtitlesQueue *q)
170 qsort(q->subs, q->nb_subs, sizeof(*q->subs),
171 q->sort == SUB_SORT_TS_POS ? cmp_pkt_sub_ts_pos
172 : cmp_pkt_sub_pos_ts);
173 for (i = 0; i < q->nb_subs; i++)
174 if (q->subs[i].duration == -1 && i < q->nb_subs - 1)
175 q->subs[i].duration = q->subs[i + 1].pts - q->subs[i].pts;
178 int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt)
180 AVPacket *sub = q->subs + q->current_sub_idx;
182 if (q->current_sub_idx == q->nb_subs)
184 if (av_copy_packet(pkt, sub) < 0) {
185 return AVERROR(ENOMEM);
189 q->current_sub_idx++;
193 static int search_sub_ts(const FFDemuxSubtitlesQueue *q, int64_t ts)
195 int s1 = 0, s2 = q->nb_subs - 1;
198 return AVERROR(ERANGE);
206 return q->subs[s1].pts <= q->subs[s2].pts ? s1 : s2;
208 if (q->subs[mid].pts <= ts)
215 int ff_subtitles_queue_seek(FFDemuxSubtitlesQueue *q, AVFormatContext *s, int stream_index,
216 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
218 if (flags & AVSEEK_FLAG_BYTE) {
219 return AVERROR(ENOSYS);
220 } else if (flags & AVSEEK_FLAG_FRAME) {
221 if (ts < 0 || ts >= q->nb_subs)
222 return AVERROR(ERANGE);
223 q->current_sub_idx = ts;
225 int i, idx = search_sub_ts(q, ts);
230 for (i = idx; i < q->nb_subs && q->subs[i].pts < min_ts; i++)
231 if (stream_index == -1 || q->subs[i].stream_index == stream_index)
233 for (i = idx; i > 0 && q->subs[i].pts > max_ts; i--)
234 if (stream_index == -1 || q->subs[i].stream_index == stream_index)
237 ts_selected = q->subs[idx].pts;
238 if (ts_selected < min_ts || ts_selected > max_ts)
239 return AVERROR(ERANGE);
241 /* look back in the latest subtitles for overlapping subtitles */
242 for (i = idx - 1; i >= 0; i--) {
243 int64_t pts = q->subs[i].pts;
244 if (q->subs[i].duration <= 0 ||
245 (stream_index != -1 && q->subs[i].stream_index != stream_index))
247 if (pts >= min_ts && pts > ts_selected - q->subs[i].duration)
253 /* If the queue is used to store multiple subtitles streams (like with
254 * VobSub) and the stream index is not specified, we need to make sure
255 * to focus on the smallest file position offset for a same timestamp;
256 * queue is ordered by pts and then filepos, so we can take the first
257 * entry for a given timestamp. */
258 if (stream_index == -1)
259 while (idx > 0 && q->subs[idx - 1].pts == q->subs[idx].pts)
262 q->current_sub_idx = idx;
267 void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
271 for (i = 0; i < q->nb_subs; i++)
272 av_free_packet(&q->subs[i]);
274 q->nb_subs = q->allocated_size = q->current_sub_idx = 0;
277 int ff_smil_extract_next_text_chunk(FFTextReader *tr, AVBPrint *buf, char *c)
282 if (!*c) // cached char?
287 end_chr = *c == '<' ? '>' : '<';
289 av_bprint_chars(buf, *c, 1);
292 } while (*c != end_chr && *c);
293 if (end_chr == '>') {
294 av_bprint_chars(buf, '>', 1);
300 const char *ff_smil_get_attr_ptr(const char *s, const char *attr)
303 const int len = strlen(attr);
307 if (!in_quotes && av_isspace(*s))
309 in_quotes ^= *s == '"'; // XXX: support escaping?
312 while (av_isspace(*s))
314 if (!av_strncasecmp(s, attr, len) && s[len] == '=')
315 return s + len + 1 + (s[len + 1] == '"');
320 static inline int is_eol(char c)
322 return c == '\r' || c == '\n';
325 void ff_subtitles_read_text_chunk(FFTextReader *tr, AVBPrint *buf)
327 char eol_buf[5], last_was_cr = 0;
328 int n = 0, i = 0, nb_eol = 0;
330 av_bprint_clear(buf);
333 char c = ff_text_r8(tr);
338 /* ignore all initial line breaks */
339 if (n == 0 && is_eol(c))
342 /* line break buffering: we don't want to add the trailing \r\n */
344 nb_eol += c == '\n' || last_was_cr;
348 if (i == sizeof(eol_buf) - 1)
350 last_was_cr = c == '\r';
354 /* only one line break followed by data: we flush the line breaks
358 av_bprintf(buf, "%s", eol_buf);
362 av_bprint_chars(buf, c, 1);
367 void ff_subtitles_read_chunk(AVIOContext *pb, AVBPrint *buf)
370 tr.buf_pos = tr.buf_len = 0;
373 ff_subtitles_read_text_chunk(&tr, buf);
376 ptrdiff_t ff_subtitles_read_line(FFTextReader *tr, char *buf, size_t size)
381 while (cur + 1 < size) {
382 unsigned char c = ff_text_r8(tr);
384 return ff_text_eof(tr) ? cur : AVERROR_INVALIDDATA;
385 if (c == '\r' || c == '\n')
390 if (ff_text_peek_r8(tr) == '\r')
392 if (ff_text_peek_r8(tr) == '\n')